GitHub user bdrillard opened a pull request:
https://github.com/apache/spark/pull/20010
[SPARK-22826][SQL] findWiderTypeForTwo Fails over StructField of Array
## What changes were proposed in this pull request?
[SPARK-22826](https://issues.apache.org/jira/browse/SPARK-22826)
Attempting to find the tightest common type over a struct holding fields of
`ArrayType` or `MapType` will fail if the types of those struct fields are not
exactly equal. See the JIRA for an example.
## How was this patch tested?
This patch adds a test case for `ArrayType` and `MapType` for finding
tightest common types.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/bdrillard/spark SPARK-22826
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20010.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20010
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commit 1ac4b0be7926d24b5cbee54e0a8b56381adda462
Author: ALeksander Eskilson <alek.eskil...@cerner.com>
Date: 2017-12-18T21:09:18Z
[SPARK-22826] adding support for tighest type coercion over array/map types
in a structfield
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